HomeMy WebLinkAbout20090573 Ver 1_More Info Received_20090821BLACK & VEATCH
Building a world of difference
Winston-Salem/ Forsyth County Utility Commission
R.A. Thomas Water Treatment Plant Improvements
Sue Homewood
NC DWQ, Winston-Salem Regional Office
585 Waughtown Street
Winston-Salem, NC 27107
Subject: 401 Water Quality Certification
Dear Sue Homewood,
August 20, 2009
o9-o513
In reference to the 401 Water Quality Certification and Section 404 Nationwide Permit No. 39 for the
R.A. Thomas Water Treatment Plant Improvements, please find the following:
Revised pages 6, 7, and 8 of the Pre-Construction Notification Form enumerating the previously
submitted stream impacts along with the impacts associated with Stream Impact No. S6 and S7 which
result in an additional 5 linear feet of permanent impacts and 20 linear feet of temporary impacts
increasing the total impact to 264 linear feet.
Revised Location Map illustrating the locations of the enumerated stream impacts.
Detail K of Sheet B23 for a detail of the connection to existing main.
In addition to this information, please reference the following previously submitted information:
• Contract Drawing Sheet B 13 which shows the connection of the new 48" Salem Lake Raw Water
Transmission Main to the existing main (included in the submittal dated May 18, 2009).
• Letter from Brian Walker of Pizzagalli Construction Company describing how they plan to construct
the pipelines and structures associated with these stream impacts (included in the submittal dated
July 21, 2009).
Sincerely,
Aw.
Kurtis Proffit, P.E.
Enclosure[s]
cc: Ian McMillan, NC DWQ, Wetlands/401 Certification Unit (w/ enclosures)
John Thomas, U.S. Army Corps of Engineers (w/ enclosures)
Brian Walker, Pizzagalli Construction Company (w/ enclosures)
Jeff Davis, B&V (w/ enclosures)
David Saunders, CCUC (w/o enclosures)
Terry Cornett, B&V (w/o enclosures)
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B&V File D-1?' _tt
BLACK & VEATCH INTERNATIONAL COMPANY 9000 Regency Parkway, Suite 200 • Cary, NC 27518 919-462-7501 . Fax 919-462-8356
2. Wetland Impacts
If there are wetland impacts proposed on the site, then complete this question for each wetland area impacted.
2a. 2b. 2c. 2d. 2e. 2f.
Wetland impact Type of jurisdiction
number - Type of impact Type of wetland Forested (Corps - 404, 10 Area of impact
Permanent (P) or (if known) DWQ - non-404, other) (acres)
Temporary T
W1 ? P R T ? Yes ? Corps
? No ? DWQ
W2 ? P ? T ? Yes ? Corps
? No ? DWQ
W3 ? P ? T ? Yes ? Corps
? No ? DWQ
W4 ? P ? T ? Yes ? Corps
? No ? DWQ
W5 ? P ? T ? Yes ? Corps
? No ? DWQ
W6 ? P ? T ? Yes ? Corps
? No ? DWQ
2g. Total wetland impacts
2h. Comments:
3. Stream Impacts
If there are perennial or intermittent stream impacts (including temporary impacts) proposed on the site, then complete this
question for all stream sites impacted.
3a. 3b. 3c. 3d. 3e. 3f. 3g.
Stream impact Type of impact Stream name Perennial Type of jurisdiction Average Impact
number - (PER) or (Corps - 404, 10 stream length
Permanent (P) or intermittent DWQ - non-404, width (linear
Temporary (T) (INT)? other) (feet) feet)
Demolition of the
existing and
construction of a
S1 ®P ? T new Plant Outlet Unnamed ® PER ® Corps 20 51
Structure in the Tributary ? INT ? DWQ
same location in a
dead end branch
off the stream
Culvert extension
and construction
S2 ®P ? T of a concrete Unnamed ® PER ® Corps 13 40
endwall with rip- Tributary ? INT ? DWQ
rap outlet
stabiliziation
12"Lagoon
S3 ®P ? T Decant creek
crossing with rip- Unnamed ® PER ® Corps
10
38
rap stream Tributary ? INT ? DWQ
stabilization
Temporary stream
bypass for Stream
Impact No. S2
S4 ? P ® T with bypass Unnamed ® PER ® Corps 13 90
pumping and Tributary ? INT ? DWQ
cofferdams
located 80'
upstream and 10'
Page 6 of 12
PCN Form - Version 1.3 December 10, 2008 Version
downstream .
Duration of
approximately 6
weeks.
Temporary stream
bypass for Stream
Impact No. S3
with bypass
pumping and
S5 ? P ®T cofferdams Unnamed ® PER ® Corps 10 20
located 10' Tributary ? INT ? DWQ
upstream and
downstream.
Duration of
approximately 1
week.
48" Raw Water
Interconnect
Pipeline - demo
existing pipeline
S6 ® P ? T and tie into Unnamed ® PER ® Corps 10 5
existing and Tributary ? INT ? DWQ
replace old pipe
onsite - pipe
crosses under
stream
3h. Total stream and tributary impacts 264
3i. Comments: Note that stream impact No. S1 is actually a dead end branch off the unnamed tributary and will not impact the
flow through the tributary. Temporary bypassing is therefore not required for this impact.
4. Open Water Impacts
If there are proposed impacts to lakes, ponds, estuaries, tributaries, sounds, the Atlantic Ocean, or any other open water of
the U.S. then individually list all open water impacts below.
4a. 4b. 4c. 4d. 4e.
Open water Name of waterbody
impact number - (if applicable) Type of impact Waterbody type Area of impact (acres)
Permanent (P) or
Temporary T
01 ?P?T
02 ?P?T
03 ?P?T
04 ?P?T
4L Total open water impacts
4g. Comments:
5. Pond or Lake Construction
If and or lake construction proposed, then complete the chart below.
5a. 5b. 5c. 5d. 5e.
Wetland Impacts (acres) Stream Impacts (feet) Upland
Pond ID Proposed use or purpose (acres)
number of pond
Flooded Filled Excavated Flooded Filled Excavated Flooded
P1
P2
5f. Total
Page 7 of 12
PCN Form - Version 1.3 December 10, 2008 Version
3. Stream Impacts Continued
3a. 3b. 3c. 3d. 3e. 3f. 3g.
Stream impact Type of impact Stream name Perennial Type of Average Impact
number - (PER) or jurisdiction stream length
Permanent (P) or intermittent (Corps - 404, 10 width (linear
Temporary (T) (INT)? DWQ - non-404, (feet) feet)
other
Temporary stream
bypass for Stream
Impact No. S6 with
bypass pumping
and cofferdams Unnamed
S7 located 10'
' Tributary PER Corps 10 20
upstream and 10
downstream .
Duration of
approximately 2
weeks.
7-Additional
5g. Comments:
5h. Is a dam high hazard permit required?
? Yes ? No If yes, permit ID no:
5i. Expected pond surface area (acres):
5j. Size of pond watershed (acres):
5k. Method of construction:
6. Buffer Impacts (for DWQ)
If project will impact a protected riparian buffer, then complete the chart below. If yes, then individually list all buffer impacts
below. If an impacts require mitigation, then you MUST fill out Section D of this form.
6a. ? Neuse ? Tar-Pamlico ? Other:
Project is in which protected basin? ? Catawba ? Randleman
6b. 6c. 6d. 6e. 6f. 6g.
Buffer impact
number - Reason Buffer Zone 1 impact Zone 2 impact
Permanent (P) or for Stream name mitigation (square feet) (square feet)
Temporary T im act required?
B1 ?P?T ?Yes
? No
B2 ?P?T ?Yes
? No
B3 ?P?T ?Yes
? No
6h. Total buffer impacts
6i. Comments:
D. Impact Justification and Mitigation
1. Avoidance and Minimization
1a. Specifically describe measures taken to avoid or minimize the proposed impacts in designing project.
Stream impact No. S3 crosses the creek at an angle less than 75 degrees in order to avoid conflict with the existing 15"
sanitary sewer line on the east side of Brushy Fork Creek and connect to the proposed Wash Water Equalization Basin on the
west side of the creek.
The structures associated with stream impacs S1 and S2 are essential for the water treatment plant improvements but were
designed to minimize stream impacts as much as possible.
In reference to stream impact No. S6 no impact to the stream was antcipated during design for the 48" raw water interconnect,
but due to the location of the connection in relation to the stream found during construction it was determined that there will be
some impact associated with it.
1b. Specifically describe measures taken to avoid or minimize the proposed impacts through construction techniques.
In accordance with Contract Drawing B11 Note 3, the existing creek is to be intercepted and bypassed around stream impacts
S2, S3, and S6 such that no water flows through any distrubed area until construction of these facilities is complete. Rip-rap
stabilization per Detail CS on Sheet B36 is shown for these structures to protect the stream-bank during and after
construction.
2. Compensatory Mitigation for Impacts to Waters of the U.S. or Waters of the State
2a. Does the project require Compensatory Mitigation for ? Yes ® No
impacts to Waters of the U.S. or Waters of the State?
2b. If yes, mitigation is required by (check all that apply): ? DWQ ? Corps
? Mitigation bank
2c. If yes, which mitigation option will be used for this
? Payment to in-lieu fee program
project?
? Permittee Responsible Mitigation
Page 8 of 12
PCN Form - Version 1.3 December 10, 2008 Version
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